Can't see some Diploma cards when playing the Potion card

[DetectiveCrowsfeet]

I noticed that when I play the Potion card, I can't see under the two cards that I draw, so I can't re-check what the available Diploma cards are. Even when the opponent is playing the Potion card, I can't check the Diploma cards that are covered by the opponent's drawn cards. Is that supposed to happen in the game (like in the physical game) or is it a digital game issue?

[FSKFSK]

The available diploma cards are 4,5,6,7,8 or 3,5,7,9,11. You can see what diploma cards your opponent already purchased by scrolling down.